Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 29. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/portfolios/29/holdings` accepts POST requests and is gated by an x402 payment challenge. The maximum amount required per call is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the `exact` scheme to the specified payTo address, with a 300-second timeout window. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.
Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual data returned after payment is unknown. The endpoint appears to be one of many on the platform, all priced at $0.02 per request.
Capabilities
Use cases
- —Fetching portfolio holdings data without needing API key registration
- —Programmatic access to portfolio composition for automated trading or analytics
- —Agent-driven portfolio monitoring with per-call micropayments
Fit
Best for
- —Agents or apps that need on-demand portfolio holdings data with no subscription commitment
- —Developers experimenting with x402 pay-per-request patterns on Base
- —Low-volume consumers who prefer micropayments over monthly API plans
Not for
- —High-frequency bulk data consumers who need sub-cent pricing per call
- —Users who need detailed API documentation or response schema guarantees before integrating
- —Anyone requiring non-USDC or non-Base payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/29/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of 'portfolio 29 holdings' is opaque — it's unclear whether this returns real financial data or demo/placeholder content.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No request body schema or response schema provided; actual data returned after payment is unknown
- —The endpoint references a specific portfolio ID (29) with no explanation of what portfolio this represents
- —No OpenAPI or machine-readable spec discovered
Citations
- —The endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/29/holdings
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/29/holdings